Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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Chapter 6      Using Message Filters to Enforce Email Policies
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Cisco IronPort AsyncOS 7.5 for Email Advanced Configuration Guide
OL-25137-01
encrypted member along with unencrypted members will be considered protected. 
Similarly, PDF file that has no open password will not be considered protected, 
even though it may restrict copying or printing with a password. The following 
example shows protected attachments sent to a policy quarantine:
Detecting Unprotected Attachments
The 
attachment-unprotected
 filter tests whether any attachment in the message 
is not password protected.  This message filter complements the 
attachment-protected
 filter. You might use this filter on outgoing mail to detect 
outgoing mail that is unprotected. The following example shows AsyncOS 
detecting unprotected attachments on an outgoing listener and quarantining the 
messages:
quarantine_protected:
if attachment-protected 
{
quarantine("Policy");
}
quarantine_unprotected:
if attachment-unprotected 
{
quarantine("Policy");
}